function pageWidth() {return window.innerWidth != null? window.innerWidth: document.body != null? document.body.clientWidth:null;}
function pageHeight() {return window.innerHeight != null? window.innerHeight: document.body != null? document.body.clientHeight:null;}

function changeOne()
{
		var img_name = new Array('/img/boll.png', '/img/svamp.png',
		'/img/rulle.png', '/img/thing.png', '/img/tumme.png', '/img/egg.png', '/img/tear.png', '/img/cykel.png', '/img/spring.png', '/img/apple.png', '/img/stege.png', '/img/table.png');

		var l = img_name.length;

		var rnd_no = Math.floor(l*Math.random());

		document.getElementById('randomimage').src = img_name[rnd_no];

		elem = document.getElementById('icon');
 		elem.style.top =  Math.floor(Math.random()* (pageHeight()-50));
 		elem.style.left = Math.floor(Math.random()* (pageWidth()-230));


}

window.onload = changeOne;